What do girls giggle at when they like a guy?

Hey girls,

I know that most girls giggle when they are close to the guy they like but what exactly do you giggle at:

At what he says (his words) or at what he does (his actions) or is it both?

on a more personal note, I will give an example. Me and this girl had to read a short story in class. She was done before me and I told her she's a fast reader. She giggled. She giggled at my words. A minute later, my teacher threw me a copy of the short story. I caught it. She giggled at that too. She giggled at my action. So girls, do you giggle at just words or just actions or both? (also, how would you interpret the situation I just presented to u?)

What do girls giggle at when they like a guy?
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